package com.calf.cn.utils;

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Map;

/** 
 * 
 * @author wangxiangyang
 *
 */
public class HttpClientUtil {  
    private static PoolingHttpClientConnectionManager cm;
    private static String EMPTY_STR = "";  
    private static String UTF_8 = "UTF-8";  
  
    private static void init() {  
        if (cm == null) {  
            cm = new PoolingHttpClientConnectionManager();
            cm.setMaxTotal(50);// 整个连接池最大连接数  
            cm.setDefaultMaxPerRoute(5);// 每路由最大连接数，默认值是2  
        }  
    }  

    /** 
     * 通过连接池获取HttpClient 
     *  
     * @return 
     */  
    private static CloseableHttpClient getHttpClient() {
        init();  
        return HttpClients.custom().setConnectionManager(cm).build();
    }  
  
    /** 
     *  
     * @param url 
     * @return 
     */  
    public static String httpGetRequest(String url) {  
        HttpGet httpGet = new HttpGet(url);
        return getResult(httpGet);  
    }  
  
    public static String httpGetRequest(String url, Map<String, Object> params) throws URISyntaxException {  
        URIBuilder ub = new URIBuilder();
        ub.setPath(url);  
  
        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        ub.setParameters(pairs);  
  
        HttpGet httpGet = new HttpGet(ub.build());
        return getResult(httpGet);  
    }  
  
    public static String httpGetRequest(String url, Map<String, Object> headers, Map<String, Object> params)  
            throws URISyntaxException {  
        URIBuilder ub = new URIBuilder();
        ub.setPath(url);  
  
        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        ub.setParameters(pairs);  
  
        HttpGet httpGet = new HttpGet(ub.build());
        for (Map.Entry<String, Object> param : headers.entrySet()) {  
            httpGet.addHeader(param.getKey(), String.valueOf(param.getValue()));  
        }  
        return getResult(httpGet);  
    }  
  
    public static String httpPostRequest(String url) {  
        HttpPost httpPost = new HttpPost(url);
        return getResult(httpPost);  
    }  
  
    public static String httpPostRequest(String url, Map<String, Object> params) throws UnsupportedEncodingException {  
        HttpPost httpPost = new HttpPost(url);
        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));
        return getResult(httpPost);  
    }  
  
    public static String httpPostRequest(String url, Map<String, Object> headers, Map<String, Object> params)  
            throws UnsupportedEncodingException {  
        HttpPost httpPost = new HttpPost(url);
  
        for (Map.Entry<String, Object> param : headers.entrySet()) {  
            httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));  
        }  
  
        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));
  
        return getResult(httpPost);  
    }  
  
    private static ArrayList<NameValuePair> covertParams2NVPS(Map<String, Object> params) {
        ArrayList<NameValuePair> pairs = new ArrayList<NameValuePair>();
        for (Map.Entry<String, Object> param : params.entrySet()) {  
            pairs.add(new BasicNameValuePair(param.getKey(), String.valueOf(param.getValue())));
        }  
  
        return pairs;  
    }  
  
    /** 
     * 处理Http请求 
     *  
     * @param request 
     * @return 
     */  
    private static String getResult(HttpRequestBase request) {
        // CloseableHttpClient httpClient = HttpClients.createDefault();  
        CloseableHttpClient httpClient = getHttpClient();
        try {  
            CloseableHttpResponse response = httpClient.execute(request);
            // response.getStatusLine().getStatusCode();  
            HttpEntity entity = response.getEntity();
            if (entity != null) {  
                // long len = entity.getContentLength();// -1 表示长度未知  
                String result = EntityUtils.toString(entity);
                response.close();  
                // httpClient.close();  
                return result;  
            }  
        } catch (ClientProtocolException e) {
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        } finally {  
  
        }  
  
        return EMPTY_STR;  
    }  
    
}  